Most PCs that refuse Windows 11 fail on a single check: TPM 2.0, the processor generation list, or the 64 GB storage floor. Every check takes minutes to run, and a "failed" verdict often means one firmware setting rather than a dead machine.
Your laptop has prompted you about Windows 11 three times this month, and three times the install has been refused. If you're left wondering whether the machine is on its way out, you're in good company; the upgrade message gives you a refusal without a reason, which makes it feel final.
There's a fair case for the confusion. Microsoft's requirements page reads like a spec sheet for a new purchase rather than an upgrade check, and the word "TPM" means nothing to most people who own one. The refusal message doesn't tell you which requirement failed or what to do about it.
The refusal, though, comes down to one specific gate your PC didn't pass, and that gate is checkable in minutes. Windows 10 reached end of support on 14 October 2025 (per Microsoft's lifecycle page, checked 2026-09-07), so an unresolved refusal leaves you on an unpatched system, and the alternative (a brand-new laptop) is often money spent on a problem that cost nothing to fix.
Here's the point: eligibility is a checklist, not a verdict. Run the checks below in order and you'll know within ten minutes whether your PC is eligible for Windows 11 as it stands, one setting away, or genuinely at the end of its road.
What are the minimum requirements for Windows 11?
Windows 11 requires a 1 GHz dual-core 64-bit processor from Microsoft's approved list, 4 GB of RAM, 64 GB of storage, a DirectX 12 graphics card, a UEFI motherboard with Secure Boot available, TPM version 2.0, and a 720p display of at least 9 inches. Those are the gates; your PC needs all of them.
The table below is the full list, quoted from Microsoft's requirements page (checked 2026-09-07):
| Requirement | Minimum | What it means in practice |
|---|---|---|
| Processor | 1 GHz+, 2+ cores, 64-bit, from the approved list | Roughly Intel 8th generation or AMD Ryzen 2000 series onwards |
| Memory | 4 GB | The floor; 8 GB is the practical comfort line |
| Storage | 64 GB available | Windows 10 updates have pushed beyond this over time |
| Graphics | DirectX 12 compatible, WDDM 2.0 driver | Almost any discrete or integrated GPU from the last decade |
| Firmware | UEFI, Secure Boot capable | Older 'Legacy BIOS' boards fail here |
| TPM | Version 2.0 | Built into most CPUs since around 2016; often switched off |
| Display | 720p, 9 inches or larger, 8 bits per colour | Rarely the blocker |
| Internet | Required for updates; Home edition needs a Microsoft account at setup | S mode is Home-only, and switching out is one-way |
Two of these deserve a caveat. The 64 GB storage floor has been edged upwards by update sizes, so a machine with exactly 64 GB may pass the check and struggle afterwards. And the processor rule is a list, not a speed test: a fast chip from 2016 fails while a modest one from 2018 passes, because the list is about silicon generation, not gigahertz.
How do I check if my PC has TPM 2.0?
Press Windows key + R, type tpm.msc, and press Enter. If the window that opens says "The TPM is ready for use" with a specification version of 2.0, you pass. If it says the TPM is ready at version 1.2, your machine fails as configured but may still be fixable in firmware settings.
The second method suits people who prefer plain menus: open Settings → Privacy & Security → Windows Security → Device Security, and look for the "Security processor" entry, which reports the same version information. Both routes read the same chip, so they should agree; if they don't, a firmware update usually settles it.
The most common false negative sits in the firmware rather than the chip. Many PCs from 2016 onwards ship with a TPM 2.0 that is present but switched off, labelled in the BIOS as "TPM", "fTPM" (AMD) or "PTT" (Intel). Enabling it is a two-minute change, and it converts a failed check into a pass on machines that were eligible all along. I've switched plenty of Ascot and Windlesham machines this way, usually while the owner was halfway through browsing replacement laptops. If you'd rather not go into the BIOS yourself, this is a standard part of an upgrade check I can run for you.
Which CPUs are compatible with Windows 11?
The approved list starts at Intel's 8th generation and AMD's Ryzen 2000 series, which covers most PCs bought new from 2018 onwards. A compatible 64-bit processor must appear on Microsoft's CPU list (checked 2026-09-07), and the generation matters more than the clock speed.
Checking your own chip takes seconds: open Task Manager (Ctrl+Shift+Esc), look at the Performance tab, and read the processor name. An "i5-8250U" is 8th generation and passes; an "i7-7700HQ" is 7th and doesn't, however capable it still feels. Ryzen chips are simpler, since almost everything numbered 2000 or above is on the list.
The edge case that catches people is the otherwise-excellent 7th-generation machine: it may run Windows 11 comfortably, but Microsoft's installer will refuse it all the same, because the list is a support policy rather than a performance judgement. That decision is worth naming for what it is. A refused-but-capable CPU doesn't make the laptop junk; it makes the laptop a Windows 10 machine without security patches, which is a different and more urgent problem. The honest options are in the final section below.
Does your PC meet the RAM and storage minimums?
You pass on memory with 4 GB and on storage with 64 GB available, and you can confirm both under Settings → System → About. Those are floors for installation rather than targets for comfort, and the two numbers behave differently once you're actually using the machine.
| Resource | Minimum (passes the check) | Comfortable (runs well day to day) | How to check yours |
|---|---|---|---|
| RAM | 4 GB | 8 GB, or 16 GB for heavier multitasking | Settings → System → About |
| Storage | 64 GB available | 256 GB SSD with 15%+ free | Settings → System → Storage |
The gap between the columns matters more than the columns themselves. A 4 GB machine installs Windows 11 and then swaps to the disk constantly, which feels like a fault and usually gets blamed on the upgrade. A 64 GB eMMC laptop is the other honest case: technically compliant, practically cramped, because the OS plus updates consume most of the space within a year.
There's a well-priced fix for the storage half. An SSD upgrade transforms boot and load times on the same hardware, and on eligible machines it pairs neatly with the Windows 11 move; my SSD upgrade service does it for a fixed £89 including data cloning, which is the same figure quoted in my guide to upgrading versus replacing. If your RAM is the constraint, that's a replacement conversation rather than an upgrade one for most laptops, since memory is frequently soldered.
Why won't Windows 11 install even when the check passes?
The usual cause is firmware: Secure Boot needs to be available, the board must run in UEFI mode rather than Legacy BIOS, and the installation route itself has gates. A PC can pass the hardware list and still be refused at install time by one of these settings.
Three checks resolve most of it. First, confirm Secure Boot status under Settings → System → Recovery → Advanced startup, or in the BIOS; "capable" is enough, enabled is better. Second, confirm the board is in UEFI mode; a PC upgraded from a very old Windows install may still be running Legacy BIOS, and Windows 11 requires UEFI. Third, try a different installation route: the Installation Assistant, the Media Creation Tool, and an in-place upgrade each have slightly different gates, so a refusal on one route doesn't always mean a refusal on all.
The Legacy BIOS case is the genuinely disqualifying one, and it deserves a straight answer. Converting a system disk from Legacy to UEFI (Microsoft's mbr2gpt tool does it) is possible, but on a ten-year-old board it's surgery with a real chance of an unbootable machine. When the hardware itself is that old, the money usually belongs in a replacement fund rather than the attempt.
What if your PC fails the check? The honest options
A failed check leaves you three honest routes: enable the blocked feature in firmware where one exists, upgrade the component that makes sense (usually storage), or plan a replacement on your own timetable rather than under panic. What you should never do is run a registry bypass to force the install.
| Route | Cost | When it's the right call |
|---|---|---|
| Enable TPM / Secure Boot in firmware | Free | CPU and RAM pass; the chip is present but off (2016+ machines especially) |
| SSD upgrade, then install | £89 fixed with me | Storage or speed is the weak point and the CPU is on the list |
| Replace the machine | New-laptop money | 7th-gen-or-older CPU, or RAM/storage/firmware all fail together |
Whichever route you take, do the same thing first: back up. A Windows 10 machine past end of support is living on borrowed patches, and an OS move is exactly the kind of event that exposes a failing disk. My data recovery and backup service sets up automated backups in an evening, and I'd rather fit one of those than recover a library afterwards. If you're in Ascot, Bracknell or Windlesham and would rather hand the checklist to someone else, the full check and fix runs on-site or remotely at my published rates, and you'll get a straight "it's eligible" or "it isn't, and here's why".
Windows 11 eligibility FAQs
Can I bypass TPM 2.0 and install Windows 11 anyway?
Registry workarounds exist and Microsoft tolerates them, but I don't fit them. A bypassed install sits outside Microsoft's support position, and the machine still carries every other risk of unsupported hardware. On most affected PCs, enabling the real TPM in firmware achieves the same result legitimately.
Is Windows 11 free?
Yes, for eligible machines running a licensed Windows 10. The upgrade itself costs nothing; the costs appear when hardware needs bringing up to the minimum, which is where the fixed-price paths above come in.
Can a 7th-generation Intel PC run Windows 11?
Not through supported channels; the approved list starts at 8th generation. It will keep working as a Windows 10 machine, but end of support has passed, so its sensible futures are replacement or a planned, backed-up move to new hardware.
How long do all these checks take?
About ten minutes for the full set: TPM and firmware status, CPU generation, RAM and storage figures. Mine include the same checks followed by a plain-English verdict on the machine's realistic options.
The refusal message that started this is a blunt instrument, but the situation behind it rarely is. One checklist turns "it won't install" into a named cause and a costed choice, and that choice is better made before October-style deadlines force it.
The broader shift is worth planning around: Microsoft has tied Windows support to silicon generations, which means every PC now has a defined eligibility horizon. Find out where yours sits once, and future upgrade seasons become a diary entry rather than a scramble. If you'd like a second opinion on where your machine stands, a bit about how I work is here, and the checklist above is the same one I run.